{"record":{"id":"1537bbe6f4c05a43","repo":"apache/seatunnel","slug":"single-record-fallback-completed-succeeded","errorCode":null,"errorMessage":"Single-record fallback completed: {} succeeded, {} failed and were skipped ({} skipped in total so far)","messagePattern":"Single-record fallback completed: (.+?) succeeded, (.+?) failed and were skipped \\((.+?) skipped in total so far\\)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"seatunnel-connectors-v2/connector-hugegraph/src/main/java/org/apache/seatunnel/connectors/seatunnel/hugegraph/buffer/BatchBuffer.java","lineNumber":327,"sourceCode":"                            HugeGraphConnectorErrorCode.GRAPH_OPERATION_FAILED,\n                            String.format(\n                                    \"Aborting: cumulative single-insert failures (%d) reached \"\n                                            + \"max_insert_errors (%d). Last error: %s\",\n                                    insertFailureCount, maxInsertErrors, single.getMessage()),\n                            single);\n                }\n            }\n        }\n        if (failed == batch.size()) {\n            throw new HugeGraphConnectorException(\n                    HugeGraphConnectorErrorCode.GRAPH_OPERATION_FAILED,\n                    String.format(\n                            \"All %d record(s) in the batch failed single-insert fallback\",\n                            batch.size()),\n                    lastFailure);\n        }\n        if (failed > 0) {\n            LOG.warn(\n                    \"Single-record fallback completed: {} succeeded, {} failed and were skipped \"\n                            + \"({} skipped in total so far)\",\n                    batch.size() - failed,\n                    failed,\n                    insertFailureCount);\n        }\n    }\n\n    /**\n     * Appends one line describing a skipped record — the mapped element's id/label/properties plus\n     * the server error — to the per-subtask failure file when {@code failure_data_path} is set.\n     * Best-effort: a write/open error disables further persistence rather than failing the task, so\n     * a broken debug path can never mask the real insert failure.\n     */\n    private void writeFailureSample(GraphElementEnvelope envelope, Exception failure) {\n        if (failureDataPath == null || failureDataPath.isEmpty() || failureWriterDisabled) {\n            return;\n        }","sourceCodeStart":309,"sourceCodeEnd":345,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-hugegraph/src/main/java/org/apache/seatunnel/connectors/seatunnel/hugegraph/buffer/BatchBuffer.java#L309-L345","documentation":"This WARN is logged by BatchBuffer.fallbackInsertSingly in the HugeGraph sink after a bulk write failed and every record was retried one-by-one. It reports how many records succeeded, how many were permanently skipped, and the running total of skipped records (insertFailureCount) for the task. It is a diagnostic summary, not an exception; the batch is not rethrown so the job can continue with dirty-data tolerance.","triggerScenarios":"A bulk vertex/edge insert via flushVertexGroup or flushEdgeGroup throws, the code falls back to inserting each record individually, and at least one single insert still fails (failed > 0). Common per-record causes: schema mismatch (missing vertex label/property key), constraint violation on edge, malformed property value, or transient server errors.","commonSituations":"Writing data whose properties don't match the HugeGraph schema, edge records referencing non-existent vertices, oversized batches hitting request limits, or the HugeGraph server partially rejecting records due to duplicates or serialization issues.","solutions":["Inspect the failure-sample file written by writeFailureSample (failureDataPath) to see which records were skipped and why","Pre-create or align vertex/edge labels and property keys so records match the server schema","Fix or filter bad records upstream so the single-record fallback is not needed","Increase retry tolerance or fix connectivity if the underlying cause was transient server errors"],"exampleFix":"// before: letting bad rows silently skip\n// after: validate schema before flush\nif (!schemaCache.containsPropertyKey(propertyKey)) {\n    createPropertyKeyIfNotExist(propertyKey); // ensures record won't fail single-insert\n}","handlingStrategy":"fallback","validationCode":"// Before writing, ensure schema exists so records don't fail single-insert\nclient.createVertexLabelIfNotExist(label, propertyKeys);\nclient.createEdgeLabelIfNotExist(sourceLabel, targetLabel, properties);","typeGuard":null,"tryCatchPattern":"// Monitor via logs; enable failure-data persistence to audit skipped rows\n// \"failure-data-path\" = \"/ writable/dir/failures.log\"\n// After job: parse failure sample file and reprocess skipped records","preventionTips":["Pre-create all vertex/edge labels and property keys before running the sink","Enable failure-data persistence and monitor the sample file","Validate source data against the HugeGraph schema during development","Watch the 'skipped in total so far' counter to detect systemic schema mismatches"],"tags":["hugegraph","batch-write","dirty-data","sink"],"backgroundTag":"database-write-failed","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}